Preparation method of high-purity quartz sand

The invention relates to a purification method of high-purity quartz sand, and belongs to the technical field of preparation of high-purity quartz sand. The preparation method comprises the followingsteps: cleaning and crushing natural gangue, roasting the natural gangue at 900-1300 DEG C for 4-6 hours, adding the natural gangue into a quenching solution, and carrying out rapid quenching treatment to obtain quartz particles; and grinding and screening the quartz particles to obtain quartz sand, adding the quartz sand into an acid solution, carrying out microwave-assisted leaching treatment for 1-2 hours at a temperature of 200-500 DEG C and a pressure of 4.0-21.0 MPa, carrying out solid-liquid separation to obtain a leaching solution and leaching residues, and carrying out ultrasonic cleaning and drying on the leaching residues to obtain high-purity quartz sand. According to the method, impurities in quartz sand can be efficiently removed by strictly controlling the concentration of aquenching solution, the a